[gnome-builder/wip/gtk4-port] libide/editor: include line changes for overview map

[Christian Hergert <chergert src gnome org>]

commit 8a56ac41b9c8be2b011d2c7871bd32ef3e61583d
Author: Christian Hergert <chergert redhat com>
Date:   Wed Apr 6 13:32:47 2022 -0700

    libide/editor: include line changes for overview map

 src/libide/editor/ide-editor-page.c | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/src/libide/editor/ide-editor-page.c b/src/libide/editor/ide-editor-page.c
index 56f80be6f..c41564ed7 100644
--- a/src/libide/editor/ide-editor-page.c
+++ b/src/libide/editor/ide-editor-page.c
@@ -342,6 +342,14 @@ ide_editor_page_init (IdeEditorPage *self)
                            "width-request", 2,
                            NULL);
   gtk_source_gutter_insert (gutter, renderer, 100);
+
+  /* Add gutter changes to the overview map */
+  gutter = gtk_source_view_get_gutter (GTK_SOURCE_VIEW (self->map),
+                                       GTK_TEXT_WINDOW_LEFT);
+  renderer = g_object_new (IDE_TYPE_LINE_CHANGE_GUTTER_RENDERER,
+                           "width-request", 1,
+                           NULL);
+  gtk_source_gutter_insert (gutter, renderer, 100);
 }
 
 GtkWidget *